View Full Version : Photos: Inch v Metric Receivers

Para Driver
May 10, 2008, 17:47
As luck would have it, I was able to get two recent production DSA receivers side by side. One is Inch and one is Metric. They are TYPE 1 receivers with similar radius cuts.

Photo 1 shows the left side over all. Notice the cuts up front for the different charging handles, the Inch receiver having been shortened for the folder. Also a difference at the rear of the CH slot, maybe the pin is different?

Para Driver
May 10, 2008, 17:50
This photo shows a little closer look at the front ends.. Again the shorter CH slot, but also a litte difference perhaps for the detent?

Para Driver
May 10, 2008, 17:52
Now on to the right side, primary difference is the lightening cuts. Inch has a simple slot, Metric has the fancy trapazoid doohicky. Probably doesn't make a difference??

Para Driver
May 10, 2008, 17:54
Now here's the 'Money Shot', what everyones been waiting for..
Drumroll please.... brrrrrrrrrrrrrrrr the mag well. Metric has the puny little dimple, and the Inch has the manly cut! Also a half-ass shot of the charging handle slot from the 3/4 underneath pretty useless angle.

Para Driver
May 10, 2008, 17:57
And finally, inside of the receivers, near the latch.. photo shows both have the sand cuts, and Inch has a little more relief for the dust cover tabs. A pretty insignificant detail IMHO..

Para Driver
May 10, 2008, 20:53
Originally posted by gunplumber
Should be in Ref & Data section

differences are:

Charging Handle cut: thinner rail on metric. sand down back of inch Fold to fit metric.

Top Cover tab cut: not present on metric. Can use metric dustcover

Internal Sand cut (probably not a biggie) = different style (longitudinal instead of radiused on a type 1/2 metric)

Mag Well cut:larger rectangular cut on metric. Can be added to a metric, but is a difficult procedure - cannot be made to same depth on a type 1 metric without beeaking through the front so don't copy it exactly

Hole for BHO in ejector block - the metric is about .0015 smaller diemeter, a metric BHO fits an inch but not the other way.

ALSO - on the mag catch spring the inch is larger diameter as is the recess for it on the e-block. can be opened up. a metric spring doesn't give same travel so even if using an inch mag catch on metric receiver, should open the hole slightly and use inch s;pring.

Lightening Cuts n- external (I don't think this affects performance): but an early canadian has the trapezoidal cuts of a metric 1/2 so its not totally wrong on an inch gun.

November 01, 2008, 12:30
Thanks for the info!

November 07, 2008, 22:29
Except for those Imbel inch receivers where the charging handle cut,dust cover rails and the magwell cut are the only clues you get...fortunately that's all you need!